At what time; at, during, or after the time that; at or just after, the moment that; -- used relatively.
While; whereas; although; -- used in the manner of a conjunction to introduce a dependent adverbial sentence or clause, having a causal, conditional, or adversative relation to the principal proposition; as, he chose to turn highwayman when he might have continued an honest man; he removed the tree when it was the best in the grounds.
Which time; then; -- used elliptically as a noun.
when in Afrikaans is wanneer, as
when in Dutch is wanneer, als, toen
when in Finnish is milloin
when in French is quand, lorsque
when in Latin is cum, quando, ut, ubi, cum
when in Portuguese is quando